SEARCH · Engineering Papers
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Electron thermal conductivity of non-ideal metals, taking into account arbitrary change and amplitude of electron scattering on ions and phonon spectra deformation by impurities
Calculation of polaron properties in anisotropic energy bands, and results for electron on spheroidal energy surface interacting with optical phonons
Recombination luminescence of irradiated silicon, and hole-optical phonon interaction in degenerate silicon
Ultrasonic attenuation temperature dependence in aluminum oxide explained by three phonon interaction
Ultrasonic attenuation in unirradiated and neutron irradiated quartz using three phonon scattering mechanism, noting temperature dependence
Si lattice vibrations, calculating phonon dispersion curves from microscopic model by dielectric screening theory
Polaron coupling approximation applied to electron-longitudinal optical phonon interaction on spheroidal energy band surface of strontium titanate
Phonon dispersion, perturbation theory, superfluid helium, Mossbauer effect, and neutral particles
Displacement correlations and frequency spectra for mass disordered lattices, deriving cluster expansion for phonon Green function
Superconductivity and band structure from pseudopotential for zinc and cadmium, analyzing values of electron phonon mass enhancement
Phonon interactions with recoilless gamma rays, considering usability of Mossbauer effect as probe for VHF acoustic experiments
Qualitative interpolation formula for phonon frequency spectrum of mass disordered alloys three dimensional systems at high concentrations
Polarons large to nearly small transitions, studying ground state mass dependence on bare electron mass, electron-phonon interactions model, superconducting strontium titanate, etc
Two parameter model for lattice vibrations applicable to diamond structured crystals, calculating phonon dispersion curves from dielectric screening theory
Mossbauer temperature dependent isomer shift, proposing electron density, change at resonant nucleus site by lattice phonons
Polyatomic organic adsorbates effect on field emission total energy distribution from W and Mo surfaces, discussing electronic and phononic spectra
Phonon excitations radiated from thermal source in He II below 0.3 K, using carbon film detectors
The results of numerical calculations of the transient stimulated Raman scattering reported previously have been verified experimentally under conditions where both linear dispersion and self-focusing effects were negligible. The existence of a delay between maxima of the laser and Stokes pulses is experimentally demonstrated for the first time, while the pulse shortening in time via Raman scattering is established more firmly than in previous work. The incident-laser-pulse duration, generated-Stokes-pulse duration, and delay between intensity maxima for the laser and Stokes pulses were measured with the two-photon absorption-fluorescence technique. The effective phonon-dephasing time is determined via spontaneous Raman scattering. By using these measured quantities, inferences are made as to the magnitude of the transient gain and the shape of the exciting picosecond laser pulse.